package com.citcc.common.gps;

import java.math.BigDecimal;

public class RectifyUtil {
	final static double pi = 3.14159265358979324;
    final static double a = 6378245.0;
    final static double ee = 0.00669342162296594323;
 /**
     * ����
     */
    public static double[] transform(double wgLat, double wgLon) {
    	double[] latlng = new double[2];
        double[] latlon=new double[2];
        if (outOfChina(wgLat, wgLon)) {
            latlng[0] = wgLat;
            latlng[1] = wgLon;
            latlon=latlng;
            return latlon;
        }
        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
        double radLat = wgLat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        BigDecimal b1 = new BigDecimal(dLat);
        dLat = b1.setScale(6, BigDecimal.ROUND_HALF_UP).doubleValue();
        BigDecimal b2 = new BigDecimal(dLon);
        dLon = b2.setScale(6, BigDecimal.ROUND_HALF_UP).doubleValue();
        latlng[0] = wgLat + dLat;
        latlng[1] = wgLon + dLon;
        String latitude = String.valueOf(latlng[0]);
        String longitude = String.valueOf(latlng[1]);
		//经度保存小数点后六位
//		int p = longitude.indexOf(".");
//		if (longitude.substring(p+1).length()>6) {
//			longitude = longitude.substring(0,p+7);
//		}
//		p = latitude.indexOf(".");
//		if (latitude.substring(p+1).length()>6) {
//			latitude = latitude.substring(0,p+7);
//		}
		
		latlng[0] = Double.parseDouble(latitude);
        latlng[1] = Double.parseDouble(longitude);
        latlon=latlng;
        return latlon;
    }
  private static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }

    private static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
                + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    private static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
                * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
                * pi)) * 2.0 / 3.0;
        return ret;
    }
}
